I’m guessing that Google plans to keep their apps attractive to iPhone so we don’t stop using them.
I don’t use any Google apps, but have a gmail account. I logged into YouTube on Safari the other day (I rarely do that) and quickly received an email titled, “[real name], your new Apple iPhone doesn't have the latest Google apps”
“Welcome to Google on your new Apple iPhone
Based on your Google Account activity, we recommend using these apps to stay organized, collaborate, and keep your account secure.”
They suggested GMail, Google Photos, and Google Maps.